Hive Fortress walls broken by Enhanced Flame

It's coded so funnily after the recent patch which added the "break walls" button.

I waited after wave 4 for the button to disappear, then I used the Enhanced Flame power-up. It's coded the same way as when you walk around campaign or maps and clear out those breach walls for Ailith defense missions. So when you have Enhanced Flame on in the Hive Fortress, it's the same type of enhanced flame you have while clearing those walls, and so it ends up clearing the Fortress walls too since they're technically destructible now.